This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 142 |
| 5 | 5895 |
| 6 | 417201 |
| 7 | 45046558 |
| 8 | 6891812712 |
| 9 | 1417730229765 |
| 10 | 377158121463025 |